There need not be any.
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You need to find the area of each of its faces and add them together. An icosahedron may or may not have parallel faces. For example, an icosahedron, in the form of a pyramid with a 19-gon base will have no parallel faces.
20
Icosahedron are a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles.
Icosahedron are a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles.
It has 20 faces.